|Publication number||US7280483 B2|
|Application number||US 10/863,183|
|Publication date||9 Oct 2007|
|Filing date||7 Jun 2004|
|Priority date||5 Jun 2003|
|Also published as||EP1629677A1, EP1629677A4, EP1629677B1, US20040252643, WO2004114690A1, WO2004114690B1|
|Publication number||10863183, 863183, US 7280483 B2, US 7280483B2, US-B2-7280483, US7280483 B2, US7280483B2|
|Original Assignee||Meshnetworks, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (125), Non-Patent Citations (18), Referenced by (40), Classifications (19), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims benefit under 35 U.S.C. § 119(e) from U.S. Provisional Patent Application Ser. No. 60/476,237, filed on Jun. 6, 2003, U.S. Provisional Patent Application Ser. No. 60/546,941, filed on Feb. 24, 2004, and U.S. Provisional Patent Application Ser. No. 60/546,940, filed on Feb. 24, 2004, U.S. Provisional Patent Application Ser. No. 60/476,236, filed on Jun. 6, 2003, and U.S. Provisional Patent Application Ser. No. 60/475,882, filed Jun. 5, 2003, the entire contents of each being incorporated herein by reference
1. Field of the Invention
The present invention relates to a system and method for improving the network performance of a wireless communication network by finding an optimal route between a source and a destination. An optimal route is chosen by making use of routing metrics which if carefully chosen, can provide stability to the network and also provide features like Self Healing and Load Balancing.
2. Description of the Related Art
Wireless communication networks, such as mobile wireless telephone networks, have become increasingly prevalent over the past decade. These wireless communications networks are commonly referred to as “cellular networks”, because the network infrastructure is arranged to divide the service area into a plurality of regions called “cells”. A terrestrial cellular network includes a plurality of interconnected base stations, or base nodes, that are distributed geographically at designated locations throughout the service area. Each base node includes one or more transceivers that are capable of transmitting and receiving electromagnetic signals, such as radio frequency (RF) communications signals, to and from mobile user nodes, such as wireless telephones, located within the coverage area. The communications signals include, for example, voice data that has been modulated according to a desired modulation technique and transmitted as data packets. As can be appreciated by one skilled in the art, network nodes transmit and receive data packet communications in a multiplexed format, such as time-division multiple access (TDMA) format, code-division multiple access (CDMA) format, or frequency-division multiple access (FDMA) format, which enables a single transceiver at a first node to communicate simultaneously with several other nodes in its coverage area.
In recent years, a type of mobile communications network known as an “ad-hoc” network has been developed. In this type of network, each mobile node is capable of operating as a base station or router for the other mobile nodes, thus eliminating the need for a fixed infrastructure of base stations. Details of an ad-hoc network are set forth in U.S. Pat. No. 5,943,322 to Mayor, the entire content of which is incorporated herein by reference.
More sophisticated ad-hoc networks are also being developed which, in addition to enabling mobile nodes to communicate with each other as in a conventional ad-hoc network, further enable the mobile nodes to access a fixed network and thus communicate with other mobile nodes, such as those on the public switched telephone network (PSTN), and on other networks such as the Internet. Details of these advanced types of ad-hoc networks are described in U.S. Pat. No. 7,072,605 entitled “Ad Hoc Peer-to-Peer Mobile Radio Access System Interfaced to the PSTN and Cellular Networks”, issued on Jul. 4, 2006, in U.S. Pat. No. 6,807,165 entitled “Time Division Protocol for an Ad-Hoc, Peer-to-Peer Radio Network Having Coordinating Channel Access to Shared Parallel Data Channels with Separate Reservation Channel”, issued on Oct. 19, 2004 and in U.S. Pat. No. 6,873,839 entitled “Prioritized-Routing for an Ad-Hoc, Peer-to-Peer, Mobile Radio Access System”, issued on Mar. 29, 2005, the entire content of each being incorporated herein by reference.
As can be appreciated by one skilled in the art, since certain nodes of the ad-hoc network are mobile, it is necessary for the network to maintain connectivity with those nodes. Transmitted data packets typically “hop” from mobile device to mobile device, creating a transmission path, or route, until reaching a final destination. However, transmission paths between mobile devices are often subject to change as devices move, therefore ad-hoc network communication must be able to adapt to achieve optimum performance while addressing the limited capabilities and capacities of mobile individual devices.
In a typical wireless communication network, the number of hops between the source and the destination is used as the routing metric. The lesser the number of hops the better the route. However, this can lead to un-optimal routes, as there can be a better route with more number of hops but better link quality or data rate.
Accordingly, a need exists for a system and method to discover optimal routes between a source and a destination in an efficient way using factors other than hops as the sole metrics.
An object of the present invention is to provide a system and method for locating optimal routes between a source and destination node using a broad range of Route metrics.
Another object of the present invention is to provide a system and method for calculating Route metrics using Hello messages exchanged in a network.
Another object of the present invention is to provide a system and method for calculating Route metrics using Routing messages, such as Route Request and Route Reply.
These and other objects are substantially achieved by providing a system and method for making use of routing metrics which if carefully chosen, can provide stability to the network and also provide features like Self Healing and Load Balancing. A Routing metric is calculated as a scalar number based upon a number of factors, such as number of hops, data rate, link quality and device type. Each factor can be determined by evaluation of Hello messages, or other routing messages as required.
These and other objects, advantages and novel features of the invention will be more readily appreciated from the following detailed description when read in conjunction with the accompanying drawings, in which:
The embodiments of the present invention described below provide a method and system which improves the network performance of a wireless communication network by finding an optimal route between a source and a destination. An optimal route is the one which either has lower latency and/or higher throughput and/or better utilization of the network resources. This route is chosen by making use of the routing metrics which are described in greater detail below. If carefully chosen, routing metrics can provide stability to the network and also provide features like Self Healing and Load Balancing.
In a typical wireless communication network, such as network 100 of
As can be appreciated by one skilled in the art, the nodes 102, 106 and 107 are capable of communicating with each other directly, or via one or more other nodes 102, 106 or 107 operating as a router or routers for packets being sent between nodes, as described in U.S. Pat. No. 5,943,322 to Mayor, and in U.S. Pat. Nos. 7,072,650, 6,807,165 and 6,873,839 referenced above.
As shown in
Each node 102, 106 and 107 further includes a memory 114, such as a random access memory (RAM) that is capable of storing, among other things, routing information pertaining to itself and other nodes in the network 100. As further shown in
As noted above, number of hops between a source node and a destination node is typically used as the routing metric for selecting a route between nodes in a network such as network 100 of
The routing metric is a scalar number which represents the cost between the source and the destination. The higher the cost, the worse is the route. The different factors which determines the cost can include, but are not limited to the following:
The use of these factors can be justified for the following category of reasons.
Number of Hops
In any network, the delay incurred by a packet at each hop is a function of the processing and queuing delays at the transmitting node and the transmission, including medium access, and propagation delays over the link. Thus, in a multihop network reducing the number of hops in a route may significantly reduce the end-to-end delays experienced by packets traversing the route. Routing backbones consisting of small numbers of long-range links are frequently employed to provide low-delay, high-speed connectivity between distant nodes in large networks.
In multi-hop wireless networks, the need for reduced route length is even greater than in wireline networks because of the larger delays likely to be experienced at each hop. These delays can include medium access delay resulting from contention for the shared channel, transmission delay resulting from increased packet size for error-control or direct-sequence spread-spectrum coding, retransmission delay resulting from link layer Automatic Repeat Request (ARQ) protocols for reliability over error-prone links, and radio-dependent delay such as that incurred when switching between transmission and reception modes.
A node could be using different data rate to different neighbors depending upon the reliability for the link. Given a choice, a node should use the highest data rate available to increase the throughput and thus, data rate should be a factor in the overall routing metric.
The quality of the link which can be a combined value of the RSSI level, Bit Error Rate, PDSQ values, timeouts and so forth, should also be a part of the metric to allow routing to pick a good quality link over a bad one.
There are three different device types in a wireless network, such as a Mesh Network, namely subscriber devices (SD), wireless routers (WR) and intelligent access points (IAP). Given a choice of intermediate node (i.e. not the destination node) devices should choose a WR before an SD or an IAP so that devices do not drain out batteries of other SD devices and also do not make an IAP busy. Similarly devices should use an IAP before an SD as intermediate nodes for the same reason. There can be several other devices in such a network and hence type of device should be an important part of the overall routing metrics. An example of this is described in greater detail below.
The devices used in this kind of network typically have a module called an ATP. This module reports link quality for all MAC addresses that a node has communicated by exchanging data messages. The ATP can also provide the current data rate which is used to communicate with this neighbor. The link quality/data rate can be communicated to the other module, typically routing as a scalar number. A look up table can then be used to find out the reliability of the link and the data rate used. Additional details of an ATP and link quality are discussed in U.S. Pat. No. 6,904,021, entitled “System and Method for Providing Adaptive Control of Transmit Power and Data Rate in Ad-Hoc Networks”, issued on Jun. 7, 2005; in U.S. Patent Publication Number 20040260808 entitled “A Method to Provide a Measure of Link Reliability to a Routing Protocol in an Ad Hoc Network”, published Oct. 23, 2004; in U.S. Patent Publication Number 20040246935, entitled “System and Method for Characterizing the Quality of a Link in a Wireless Network”, published on Dec. 09, 2004, the entire contents of each being incorporated herein by reference.
The following example shows a way to calculate a routing metric which is used in a system using a modified On Demand routing protocol. Details of such routing methods are further discussed in U.S. Patent Application Publication No. 20040143842 entitled “System and Method for Achieving Continuous Connectivity to an Access Point or Gateway in a Wireless Network Following an On-Demand Routing Protocol, and To Perform Smooth Handoff Of Mobile Terminals,” published on Jul. 22, 2004; in U.S. Pat. No. 7,061,925 entitled “System and Method to Improve the Overall Performance of a Wireless Communication Network”, issued on Jun. 13, 2006; and in U.S. Patent Application Publication No. 20040258040 entitled “System and Method to Maximize Channel Utilization in a Multi-Channel Wireless Communication Network”, published on Dec. 23, 2004, the entire content of each being incorporated herein by reference. A Route Metric computation in accordance with an embodiment of the present invention is described in greater detail below.
In infrastructure mode, nodes find out about the routing metric to any destination other than an IAP through exchange of routing packets. Routing metrics to an IAP can be found by exchange of routing packets as well as hearing the hello packets from the neighbors. In case there is a difference in the routing metrics which is being computed from hello messages and that from routing packets, the hello message information is used. The following are Route metrics computation examples in accordance with an embodiment of the present invention.
Route Metrics to the LAP Through Hello Messages
A source node, following the protocol referred above, knows about the routes to the IAP and the route metric to reach it from its neighbors, which periodically broadcast this information in the Hellos. This metric is then added to the metric to the particular neighbor advertising the IAP. A bias is also added to differentiate between different types of nodes and prefer one over another. Mathematically, this can be represented in the following Equation (1) below.
R sd =R sn +R nd+Next Hop Bias (1)
where Rsd=Route metric between source and destination, Rsn=Route metric between source and next hop, Rnd=Route metric between next hop and destination (which next hop reported), and Rsn i.e. Routing metric to the next hop or neighbor is calculated using the following Equation (2).
A constant number +
Different biases based on
the quality of the link and
the data rate
Routing metric to destinations other than neighbors are calculated using the Equation (1) where an additional next hop bias is added based on the type of neighbor.
In words the equation can be written as:
Routing metric to the destination=Routing metric to the next hop/neighbor+Routing metric from the next hop/neighbor to the Destination+Biased based on the type of next hop/neighbor
The following example shown in
In this example ‘s’ 120 is the current node which is trying to find the route to the destination, which is usually IAP, and ‘n’ 130 is its neighboring node advertising its route to the destination through hello packets. The hello packet 140 contains the routing metric from the neighbor to the destination which is Rnd. The routing metrics from ‘s’ to ‘n’ is Rsn and from ‘n’ to ‘s’ is Rns. The link may not be uniform and hence these values can be different. On receiving such a hello message, node ‘s’ uses the Equation (1) above to find the routing metric to the destination which is Rsd. The nodes s and n can be any device (i.e. SD, WR or IAP). In case of IAP the advertised metric is zero.
Route Metrics to Other Destinations Through Routing Messages
Route Request (RREQ) and Route Reply (RREP) are generally used in this kind of network to get routes to different nodes. These messages have a field called “Routing Metrics” and “Hop Count” which gets updated with each hop traveled. When a node initiates a Route Request it puts zero in both of these fields. Now this packet can be received by an intermediate node or a destination. In both the cases, the receiving node creates a route back to the source of the RREQ after adding their “routing metric to the neighbor” in the “Routing Metrics” field and “1” in the “Hop Count” field. It then forwards the RREQ or replies back with a RREP message as specified in the protocol. If it forwards the RREQ the receiving node does the same thing as explained before (i.e. adding route to the source route and adding the “routing metric to the neighbor” in the “Routing Metrics” field of RREQ packet and hence getting the routing metric to the source address).
The node can reply only if it has a valid route to the destination or it itself is the destination. If the node is an intermediate node, it puts the routing metric from the routing table to the field in the RREP. On receiving this RREP a node adds its “routing metric to the neighbor” who forwarded/sent this RREP. And hence has the complete routing metric to the destination concerned. RREP is forwarded to the source if the current node is not the source. Similar action is performed when the replying node is destination, except the fact that it puts zero in the “Routing Metrics” field in the RREP. This value is modified as the RREP traverses through different nodes in the way.
The following example shown in
There are four nodes shown in
If in the example of
A similar procedure can be used by node A when it finally receives the RREP. Hence it has the routing metric to node D as: RAD=RAB+RBC+RCD
A comparison of the above Routing Metric calculations is described below. Given a choice, a node should use the route with minimum route metric associated with it. The Neighbor Handling sub-module maintains a list of routes in the order of increasing route metric to the IAP. The route appearing earlier in this list is given preference over one coming later.
There can be several variations to this approach, for example, some additional bias or hysteresis can be added to prevent oscillations of routes. The “bias” can be a constant value or a function of something like metrics itself or number of hops. The use of bias is explained in the following example.
If in this example a node has a valid route to an IAP and has a metric “x” associated with it, to avoid oscillations it should not try to establish a new route unless it offers a metric which is “y” (bias) less then the current one. A still higher bias can be used if the route is towards some other IAP.
In addition to the metrics identified above, still other metrics can be used, such as battery life, bandwidth, congestion and so forth. Any such category of metrics, including the four discussed above, can be used and propagated as described above, such as in the hello message.
Although only a few exemplary embodiments of the present invention have been described in detail above, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the following claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4494192||21 Jul 1982||15 Jan 1985||Sperry Corporation||High speed bus architecture|
|US4617656||2 Jan 1986||14 Oct 1986||Tokyo Shibaura Denki Kabushiki Kaisha||Information transmission system with modems coupled to a common communication medium|
|US4736371||29 Dec 1986||5 Apr 1988||Nec Corporation||Satellite communications system with random multiple access and time slot reservation|
|US4742357||17 Sep 1986||3 May 1988||Rackley Ernie C||Stolen object location system|
|US4747130||17 Dec 1985||24 May 1988||American Telephone And Telegraph Company, At&T Bell Laboratories||Resource allocation in distributed control systems|
|US4910521||3 Aug 1981||20 Mar 1990||Texas Instruments Incorporated||Dual band communication receiver|
|US5034961||3 Jun 1988||23 Jul 1991||Software Sciences Limited||Area communications system|
|US5068916||29 Oct 1990||26 Nov 1991||International Business Machines Corporation||Coordination of wireless medium among a plurality of base stations|
|US5231634||18 Dec 1991||27 Jul 1993||Proxim, Inc.||Medium access protocol for wireless lans|
|US5233604||28 Apr 1992||3 Aug 1993||International Business Machines Corporation||Methods and apparatus for optimum path selection in packet transmission networks|
|US5241542||23 Aug 1991||31 Aug 1993||International Business Machines Corporation||Battery efficient operation of scheduled access protocol|
|US5317566||18 Aug 1993||31 May 1994||Ascom Timeplex Trading Ag||Least cost route selection in distributed digital communication networks|
|US5392450||8 Jan 1992||21 Feb 1995||General Electric Company||Satellite communications system|
|US5412654||10 Jan 1994||2 May 1995||International Business Machines Corporation||Highly dynamic destination-sequenced destination vector routing for mobile computers|
|US5424747||9 Apr 1993||13 Jun 1995||Thomson-Csf||Process and system for determining the position and orientation of a vehicle, and applications|
|US5502722||1 Aug 1994||26 Mar 1996||Motorola, Inc.||Method and apparatus for a radio system using variable transmission reservation|
|US5517491||3 May 1995||14 May 1996||Motorola, Inc.||Method and apparatus for controlling frequency deviation of a portable transceiver|
|US5555425||7 Mar 1990||10 Sep 1996||Dell Usa, L.P.||Multi-master bus arbitration system in which the address and data lines of the bus may be separately granted to individual masters|
|US5555540||17 Feb 1995||10 Sep 1996||Sun Microsystems, Inc.||ASIC bus structure|
|US5572528||20 Mar 1995||5 Nov 1996||Novell, Inc.||Mobile networking method and apparatus|
|US5615212||11 Sep 1995||25 Mar 1997||Motorola Inc.||Method, device and router for providing a contention-based reservation mechanism within a mini-slotted dynamic entry polling slot supporting multiple service classes|
|US5618045||8 Feb 1995||8 Apr 1997||Kagan; Michael||Interactive multiple player game system and method of playing a game between at least two players|
|US5621732||18 Apr 1995||15 Apr 1997||Nec Corporation||Access method and a relay station and terminals thereof|
|US5623495||15 Jun 1995||22 Apr 1997||Lucent Technologies Inc.||Portable base station architecture for an AD-HOC ATM lan|
|US5627976||20 Mar 1995||6 May 1997||Advanced Micro Devices, Inc.||Crossing transfers for maximizing the effective bandwidth in a dual-bus architecture|
|US5631897||1 Oct 1993||20 May 1997||Nec America, Inc.||Apparatus and method for incorporating a large number of destinations over circuit-switched wide area network connections|
|US5644576||16 May 1995||1 Jul 1997||International Business Machines Corporation||Medium access control scheme for wireless LAN using a variable length interleaved time division frame|
|US5652751||26 Mar 1996||29 Jul 1997||Hazeltine Corporation||Architecture for mobile radio networks with dynamically changing topology using virtual subnets|
|US5680392||16 Jan 1996||21 Oct 1997||General Datacomm, Inc.||Multimedia multipoint telecommunications reservation systems|
|US5684794||25 Jan 1996||4 Nov 1997||Hazeltine Corporation||Validation of subscriber signals in a cellular radio network|
|US5687194||22 Apr 1993||11 Nov 1997||Interdigital Technology Corporation||Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels|
|US5696903||29 Apr 1994||9 Dec 1997||Norand Corporation||Hierarchical communications system using microlink, data rate switching, frequency hopping and vehicular local area networking|
|US5701294||2 Oct 1995||23 Dec 1997||Telefonaktiebolaget Lm Ericsson||System and method for flexible coding, modulation, and time slot allocation in a radio telecommunications network|
|US5706428||14 Mar 1996||6 Jan 1998||Lucent Technologies Inc.||Multirate wireless data communication system|
|US5717689||10 Oct 1995||10 Feb 1998||Lucent Technologies Inc.||Data link layer protocol for transport of ATM cells over a wireless link|
|US5745483||29 Sep 1995||28 Apr 1998||Ricoh Company, Ltd.||Wireless computer network communication system and method having at least two groups of wireless terminals|
|US5774876||26 Jun 1996||30 Jun 1998||Par Government Systems Corporation||Managing assets with active electronic tags|
|US5781540||30 Jun 1995||14 Jul 1998||Hughes Electronics||Device and method for communicating in a mobile satellite system|
|US5787080||3 Jun 1996||28 Jul 1998||Philips Electronics North America Corporation||Method and apparatus for reservation-based wireless-ATM local area network|
|US5794154||26 Jul 1996||11 Aug 1998||Motorola, Inc.||Communications system and method of operation|
|US5796732||28 Mar 1996||18 Aug 1998||Cisco Technology, Inc.||Architecture for an expandable transaction-based switching bus|
|US5796741||5 Mar 1996||18 Aug 1998||Nippon Telegraph And Telephone Corporation||ATM bus system|
|US5805593||26 Sep 1995||8 Sep 1998||At&T Corp||Routing method for setting up a service between an origination node and a destination node in a connection-communications network|
|US5805842||26 Sep 1995||8 Sep 1998||Intel Corporation||Apparatus, system and method for supporting DMA transfers on a multiplexed bus|
|US5805977||1 Apr 1996||8 Sep 1998||Motorola, Inc.||Method and apparatus for controlling transmissions in a two-way selective call communication system|
|US5809518||20 May 1996||15 Sep 1998||Dallas Semiconductor Corporation||Command/data transfer protocol for one-wire-bus architecture|
|US5822309||15 Jun 1995||13 Oct 1998||Lucent Technologies Inc.||Signaling and control architecture for an ad-hoc ATM LAN|
|US5844905||9 Jul 1996||1 Dec 1998||International Business Machines Corporation||Extensions to distributed MAC protocols with collision avoidance using RTS/CTS exchange|
|US5845097||3 Jun 1996||1 Dec 1998||Samsung Electronics Co., Ltd.||Bus recovery apparatus and method of recovery in a multi-master bus system|
|US5857084||2 Oct 1996||5 Jan 1999||Klein; Dean A.||Hierarchical bus structure access system|
|US5870350||21 May 1997||9 Feb 1999||International Business Machines Corporation||High performance, high bandwidth memory bus architecture utilizing SDRAMs|
|US5877724||25 Mar 1997||2 Mar 1999||Trimble Navigation Limited||Combined position locating and cellular telephone system with a single shared microprocessor|
|US5881095||1 May 1997||9 Mar 1999||Motorola, Inc.||Repeater assisted channel hopping system and method therefor|
|US5881372||1 Dec 1995||9 Mar 1999||Lucent Technologies Inc.||Radio communication device and method|
|US5886992||15 Apr 1997||23 Mar 1999||Valtion Teknillinen Tutkimuskeskus||Frame synchronized ring system and method|
|US5896561||23 Dec 1996||20 Apr 1999||Intermec Ip Corp.||Communication network having a dormant polling protocol|
|US5903559||20 Dec 1996||11 May 1999||Nec Usa, Inc.||Method for internet protocol switching over fast ATM cell transport|
|US5909651||5 May 1997||1 Jun 1999||Lucent Technologies Inc.||Broadcast short message service architecture|
|US5936953||18 Dec 1997||10 Aug 1999||Raytheon Company||Multi-mode, multi-channel communication bus|
|US5943322||24 Apr 1996||24 Aug 1999||Itt Defense, Inc.||Communications method for a code division multiple access system without a base station|
|US5987011 *||30 Aug 1996||16 Nov 1999||Chai-Keong Toh||Routing method for Ad-Hoc mobile networks|
|US5987033||8 Sep 1997||16 Nov 1999||Lucent Technologies, Inc.||Wireless lan with enhanced capture provision|
|US5991279||4 Dec 1996||23 Nov 1999||Vistar Telecommunications Inc.||Wireless packet data distributed communications system|
|US6028853||6 Jun 1997||22 Feb 2000||Telefonaktiebolaget Lm Ericsson||Method and arrangement for radio communication|
|US6029217||3 Oct 1994||22 Feb 2000||International Business Machines Corporation||Queued arbitration mechanism for data processing system|
|US6034542||14 Oct 1997||7 Mar 2000||Xilinx, Inc.||Bus structure for modularized chip with FPGA modules|
|US6044062||6 Dec 1996||28 Mar 2000||Communique, Llc||Wireless network system and method for providing same|
|US6047330||20 Jan 1998||4 Apr 2000||Netscape Communications Corporation||Virtual router discovery system|
|US6052594||30 Apr 1997||18 Apr 2000||At&T Corp.||System and method for dynamically assigning channels for wireless packet communications|
|US6052752||14 Nov 1996||18 Apr 2000||Daewoo Telecom Ltd.||Hierarchical dual bus architecture for use in an electronic switching system employing a distributed control architecture|
|US6064626||31 Jul 1998||16 May 2000||Arm Limited||Peripheral buses for integrated circuit|
|US6067291||23 Sep 1997||23 May 2000||Lucent Technologies Inc.||Wireless local area network with enhanced carrier sense provision|
|US6067297||28 Jun 1996||23 May 2000||Symbol Technologies, Inc.||Embedded access point supporting communication with mobile unit operating in power-saving mode|
|US6078566||28 Apr 1998||20 Jun 2000||Genesys Telecommunications Laboratories, Inc.||Noise reduction techniques and apparatus for enhancing wireless data network telephony|
|US6104712||22 Feb 1999||15 Aug 2000||Robert; Bruno G.||Wireless communication network including plural migratory access nodes|
|US6108738||10 Jun 1997||22 Aug 2000||Vlsi Technology, Inc.||Multi-master PCI bus system within a single integrated circuit|
|US6115580||8 Sep 1998||5 Sep 2000||Motorola, Inc.||Communications network having adaptive network link optimization using wireless terrain awareness and method for use therein|
|US6122690||17 Apr 1998||19 Sep 2000||Mentor Graphics Corporation||On-chip bus architecture that is both processor independent and scalable|
|US6130881||20 Apr 1998||10 Oct 2000||Sarnoff Corporation||Traffic routing in small wireless data networks|
|US6132306||29 Mar 1996||17 Oct 2000||Cisco Systems, Inc.||Cellular communication system with dedicated repeater channels|
|US6147975||2 Jun 1999||14 Nov 2000||Ac Properties B.V.||System, method and article of manufacture of a proactive threhold manager in a hybrid communication system architecture|
|US6163699||15 Sep 1997||19 Dec 2000||Ramot University Authority For Applied Research And Industrial Development Ltd.||Adaptive threshold scheme for tracking and paging mobile users|
|US6178337||19 Jun 1997||23 Jan 2001||Qualcomm Incorporated||Wireless telecommunications system utilizing CDMA radio frequency signal modulation in conjuction with the GSM A-interface telecommunications network protocol|
|US6192053||7 Sep 1995||20 Feb 2001||Wireless Networks, Inc.||Enhanced adjacency detection protocol for wireless applications|
|US6192230||27 Sep 1993||20 Feb 2001||Lucent Technologies, Inc.||Wireless data communication system having power saving function|
|US6208870||1 Jun 1999||27 Mar 2001||Lucent Technologies Inc.||Short message service notification forwarded between multiple short message service centers|
|US6222463||25 Jun 1998||24 Apr 2001||Lucent Technologies, Inc.||Vehicle communication network|
|US6222504||14 Jan 2000||24 Apr 2001||Omnipoint Corporation||Adjustable antenna mount with rotatable antenna brackets for PCS and other antennas|
|US6223240||31 Jan 2000||24 Apr 2001||Lsi Logic Corporation||Bus bridge architecture for a data processing system capable of sharing processing load among a plurality of devices|
|US6240294||30 May 1997||29 May 2001||Itt Manufacturing Enterprises, Inc.||Mobile radio device having adaptive position transmitting capabilities|
|US6246875||26 Mar 1999||12 Jun 2001||Bell Atlantic Network Services, Inc.||Use of cellular digital packet data (CDPD) communications to convey system identification list data to roaming cellular subscriber stations|
|US6249516||27 Jan 2000||19 Jun 2001||Edwin B. Brownrigg||Wireless network gateway and method for providing same|
|US6275707||8 Oct 1999||14 Aug 2001||Motorola, Inc.||Method and apparatus for assigning location estimates from a first transceiver to a second transceiver|
|US6285892||24 Nov 1998||4 Sep 2001||Philips Electronics North America Corp.||Data transmission system for reducing terminal power consumption in a wireless network|
|US6304556||24 Aug 1998||16 Oct 2001||Cornell Research Foundation, Inc.||Routing and mobility management protocols for ad-hoc networks|
|US6327300||25 Oct 1999||4 Dec 2001||Motorola, Inc.||Method and apparatus for dynamic spectrum allocation|
|US6349091||7 Nov 2000||19 Feb 2002||Itt Manufacturing Enterprises, Inc.||Method and apparatus for controlling communication links between network nodes to reduce communication protocol overhead traffic|
|US6349210||3 Nov 2000||19 Feb 2002||Itt Manufacturing Enterprises, Inc.||Method and apparatus for broadcasting messages in channel reservation communication systems|
|US6359872||28 Oct 1997||19 Mar 2002||Intermec Ip Corp.||Wireless personal local area network|
|US6363319 *||31 Aug 1999||26 Mar 2002||Nortel Networks Limited||Constraint-based route selection using biased cost|
|US6366568||4 Oct 1995||2 Apr 2002||Interdigital Technology Corporation||Transfer station for wireless telephone distribution system with time and space diversity transmission|
|US6633544 *||24 Jun 1999||14 Oct 2003||At&T Corp.||Efficient precomputation of quality-of-service routes|
|US6646989 *||20 Mar 1999||11 Nov 2003||Lucent Technologies Inc.||Hop-by-hop routing with node-dependent topology information|
|US6704293 *||6 Dec 1999||9 Mar 2004||Telefonaktiebolaget Lm Ericsson (Publ)||Broadcast as a triggering mechanism for route discovery in ad-hoc networks|
|US6728484 *||7 Sep 1999||27 Apr 2004||Nokia Corporation||Method and apparatus for providing channel provisioning in optical WDM networks|
|US6791949 *||28 Apr 2000||14 Sep 2004||Raytheon Company||Network protocol for wireless ad hoc networks|
|US6813272 *||16 Jun 2000||2 Nov 2004||Korea Telecommunication Authority||QoS-based routing method|
|US6940832 *||17 Jan 2003||6 Sep 2005||The Research Foundation Of The City University Of New York||Routing method for mobile infrastructureless network|
|US6961310 *||8 Aug 2002||1 Nov 2005||Joseph Bibb Cain||Multiple path reactive routing in a mobile ad hoc network|
|US6963927 *||29 Aug 2000||8 Nov 2005||Lucent Technologies Inc.||Method and apparatus for computing the shortest path between nodes based on the bandwidth utilization link level|
|US7007102 *||29 Apr 2002||28 Feb 2006||Harris Corporation||Admission control in a mobile ad hoc network|
|US7027426 *||5 Aug 2002||11 Apr 2006||Harris Corporation||Multi-channel mobile ad hoc network|
|US7068600 *||29 Apr 2002||27 Jun 2006||Harris Corporation||Traffic policing in a mobile ad hoc network|
|US7111074 *||24 Jul 2001||19 Sep 2006||Pluris, Inc.||Control method for data path load-balancing on a data packet network|
|US7159035 *||25 Sep 2002||2 Jan 2007||Nokia Corporation||Unified routing scheme for ad-hoc internetworking|
|US7177295 *||8 Mar 2002||13 Feb 2007||Scientific Research Corporation||Wireless routing protocol for ad-hoc networks|
|US20020061001 *||24 Aug 2001||23 May 2002||The Regents Of The University Of California||Dynamic source tracing (DST) routing protocol for wireless networks|
|US20030026268 *||11 Mar 2002||6 Feb 2003||Siemens Technology-To-Business Center, Llc||Characteristic routing|
|US20030118027 *||26 Dec 2001||26 Jun 2003||Byoung-Joon Lee||Multi-constraint routing system and method|
|US20030179718 *||20 Mar 2003||25 Sep 2003||Nec Corporation||Route selection in a communications network using combined values of metrics of different characteristics|
|US20040029553 *||8 Aug 2002||12 Feb 2004||Harris Corporation||Multiple path reactive routing in a mobile ad hoc network|
|US20040203820 *||29 Apr 2002||14 Oct 2004||Harris Corporation||Allocating channels in a mobile ad hoc network|
|US20040233847 *||5 May 2004||25 Nov 2004||Samsung Electronics Co., Ltd.||Routing system for establishing optimal route in wireless personal area network (WPAN) and method thereof|
|US20040233855 *||19 May 2003||25 Nov 2004||Gutierrez Jose A.||Ad-hoc network and method of routing communications in a communication network|
|US20040246900 *||3 Jun 2003||9 Dec 2004||Palo Alto Research Center, Incorporated||Learning-based strategies for message-initiated constraint-based routing|
|1||Ad Kamerman and Guido Aben, "Net Throughput with IEEE 802.11 Wireless LANs", no date.|
|2||Andras G. Valko, "Cellular IP: A New Approach to Internet Host Mobility," Jan. 1999, ACM Computer Communication Review.|
|3||Benjamin B. Peterson, Chris Kmiecik, Richard Hartnett, Patrick M. Thompson, Jose Mendoza and Hung Nguyen, "Spread Spectrum Indoor Geolocation," Aug. 1998, Navigation: Journal of the Institute of Navigation, vol. 45, No. 2, Summer 1998.|
|4||C. David Young, "USAP: A Unifying Dynamic Distributed Multichannel TDMA Slot Assignment Protocol", no date.|
|5||Chip Elliott and Bob Heile, "Self-Organizing, Self-Healing Wireless Networks," 2000 IEEE, no date.|
|6||George Vardakas and Wendell Kishaba, "QoS Networking With Adaptive Link Control and Tactical Multi-Channel Software Radios", no date.|
|7||J. R. McChesney and R.J. Saulitis, "Optimization of an Adaptive Link Control Protocol for Multimedia Packet Radio Networks", no date.|
|8||J.J. Garcia-Luna-Aceves and Asimakis Tzamaloukas, "Reversing the Collision-Avoidance Handshake in Wireless Networks", no date.|
|9||J.J. Garcia-Luna-Aceves and Ewerton L. Madruga, "The Core-Assisted Mesh Protocol," Aug. 1999, IEEE Journal on Selected Areas in Communications, vol. 17, No. 8.|
|10||J.J. Garcia-Luna-Aceves and Marcelo Spohn, "Transmission-Efficient Routing in Wireless Networks Using Link-State Information", no date.|
|11||Josh Broch, David A. Maltz, David B. Johnson, Yih-Chun Hu and Jorjeta Jetcheva, "A Performance Comparison of Multi-Hop Wireless Ad Hoc Network Routing Protocols," Oct. 25-30, 1998, Proceedings of the 4<SUP>th </SUP>Annual ACM/IEEE International Conference on Mobile Computing and Networking.|
|12||Martha E. Steenstrup, "Dynamic Multipoint Virtual Circuits for Multimedia Traffic in Multihop Mobile Wireless Networks", no date.|
|13||Ram Ramanathan and Martha E. Steenstrup, "Hierarchically-Organized, Multihop Mobile Wireless Networks for Quality-of-Service Support", no date.|
|14||Ram Ramanathan and Regina Rosales-Hain, "Topology Control of Multihop Wireless Networks Using Transmit Power Adjustment", no date.|
|15||Richard North, Dale Bryan and Dennis Baker, "Wireless Networked Radios: Comparison of Military, Commercial and R&D Protocols," Feb. 28-Mar. 3, 1999, 2<SUP>nd </SUP>Annual UCSD Conference on Wireless Communications, San Diego, CA.|
|16||Wong et al., "A Pattern Recognition System for Handoff Algorithms," Jul. 2000, IEEE Journal on Selected Areas in Communications, vol. 18, No. 7.|
|17||Wong, et al., "Soft Handoffs in CDMA Mobile Systems," Dec. 1997, IEEE Personal Communications.|
|18||Zhenya Tang and J.J. Garcia-Luna-Aceves, "Collision-Avoidance Transmission Scheduling for Ad-Hoc Networks", no date.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7412245 *||1 Nov 2005||12 Aug 2008||Alpha Networks Inc.||Dynamic wireless meshing network for supporting load balance and flow control|
|US7450521 *||11 Feb 2005||11 Nov 2008||Samsung Electronics Co., Ltd.||Cost-based routing using backoff scheme|
|US7486627 *||3 Jun 2003||3 Feb 2009||Palo Alto Research Center Incorporated||Time-aware strategy for message-initiated constraint-based routing|
|US7570628 *||6 May 2005||4 Aug 2009||Intel Corporation||Methods and apparatus for providing a dynamic on-demand routing protocol|
|US7577107 *||3 Jun 2003||18 Aug 2009||Palo Alto Research Center Incorporated||Protocol specification for message-initiated constraint-based routing|
|US7577108 *||3 Jun 2003||18 Aug 2009||Palo Alto Research Center Incorporated||Learning-based strategies for message-initiated constraint-based routing|
|US7606176 *||22 Jun 2005||20 Oct 2009||Meshnetworks, Inc.||System and method to improve the performance of an on demand routing protocol in a wireless network|
|US7643483||24 Nov 2004||5 Jan 2010||Microsoft Corporation||System and method for using a hop limited cast for internet egress point selection|
|US7649899 *||29 Nov 2004||19 Jan 2010||Microsoft Corporation||System and method for dynamic egress routing through a single default gateway in a mesh network|
|US7706282 *||25 Jun 2003||27 Apr 2010||Leping Huang||Bluetooth personal area network routing protocol optimization using connectivity metric|
|US7715395||24 Nov 2004||11 May 2010||Microsoft Corporation||System and method for expanding the range of a mesh network|
|US7764635 *||26 Apr 2005||27 Jul 2010||Telcordia Technologies, Inc.||Cross-layer self-healing in a wireless ad-hoc network|
|US7869809 *||13 May 2005||11 Jan 2011||Intel Corporation||Radio resource measurement and estimation|
|US7899483||8 Oct 2007||1 Mar 2011||Honeywell International Inc.||Method and system for performing distributed outer loop power control in wireless communication networks|
|US7995501 *||16 Jan 2008||9 Aug 2011||Firetide, Inc.||Route optimization for on-demand routing protocols for mesh networks|
|US8014337||27 Oct 2008||6 Sep 2011||Motorola Solutions, Inc.||Method and system for wireless multi-hopping communication|
|US8085672 *||8 Jul 2005||27 Dec 2011||Honeywell International Inc.||Wireless routing implementation|
|US8107387||25 Mar 2008||31 Jan 2012||Honeywell International Inc.||Method to operate a wireless network having a predictable and stable performance|
|US8155059 *||5 Jun 2009||10 Apr 2012||Oki Electric Industry Co., Ltd.||Wireless communications connection control method|
|US8200270||20 Aug 2007||12 Jun 2012||Honeywell International Inc.||Method for adusting power at a node|
|US8294568 *||10 Jul 2007||23 Oct 2012||Venture Corporation Limited||Wireless mine tracking, monitoring, and rescue communications system|
|US8509152 *||5 Nov 2008||13 Aug 2013||Electronics And Telecommunications Research Institute||Method and apparatus for routing in wireless network|
|US8599743 *||15 Nov 2010||3 Dec 2013||Ricoh Company, Ltd.||Method, apparatus, and system for reducing power consumption in a mesh network|
|US8665841 *||19 May 2009||4 Mar 2014||Marvell International Ltd.||Multiple simultaneous mesh routes|
|US8737268 *||8 Aug 2011||27 May 2014||Firetide, Inc.||Route optimization for on-demand routing protocols for mesh networks|
|US8750321||1 Nov 2011||10 Jun 2014||Interdigital Technology Corporation||Method and signaling to enhance association in mesh systems|
|US8798034 *||31 Mar 2009||5 Aug 2014||Motorola Solutions, Inc.||System and method for selecting a route based on link metrics incorporating channel bandwidth, spatial streams and/or guard interval in a multiple-input multiple-output (MIMO) network|
|US20040246900 *||3 Jun 2003||9 Dec 2004||Palo Alto Research Center, Incorporated||Learning-based strategies for message-initiated constraint-based routing|
|US20040246901 *||3 Jun 2003||9 Dec 2004||Palo Alto Research Center, Incorporated||Time-aware strategy for message-initiated constraint-based routing|
|US20040246904 *||3 Jun 2003||9 Dec 2004||Palo Alto Research Center, Incorporated||Protocol specification for message-initiated constraint-based routing|
|US20040264466 *||25 Jun 2003||30 Dec 2004||Nokia Corporation||Bluetooth personal area network routing protocol optimization using connectivity metric|
|US20050185588 *||11 Feb 2005||25 Aug 2005||Samsung Electronics Co., Ltd. & City University Of New York||Cost-based routing using backoff scheme|
|US20050286419 *||22 Jun 2005||29 Dec 2005||Meshnetworks, Inc.||System and method to improve the performance of an on demand routing protocol in a wireless network|
|US20090303931 *||10 Dec 2009||Oki Electric Industry Co., Ltd.||Wireless communications connection control method|
|US20100246480 *||30 Sep 2010||Motorola, Inc.||System and method for selecting a route based on link metrics incorporating channel bandwidth, spatial streams and/or guard interval in a multiple-input multiple-output (mimo) network|
|US20110116402 *||19 May 2011||Ricoh Company, Ltd.||Method, apparatus, and system for reducing power consumption in a mesh network|
|US20110164565 *||5 Nov 2008||7 Jul 2011||Nam Kyung Lee||Method and apparatus for routing in wireless network|
|US20120176931 *||12 Jul 2012||Jorjeta Jetcheva||Route optimization for on-demand routing protocols for mesh networks|
|WO2004064303A2||13 Jan 2004||29 Jul 2004||Meshnetworks Inc||Method for continuous connectivity to an access point in a wireless network|
|WO2006052715A2||3 Nov 2005||18 May 2006||Avinash Joshi||System and method to decrease the route convergence time and find optimal routes in a wireless communication network|
|U.S. Classification||370/238, 709/241, 370/390, 370/232, 370/349, 370/312, 370/230.1|
|International Classification||H04L12/56, H04B7/005, H04L12/28, H04W52/46|
|Cooperative Classification||H04W52/46, H04W40/02, H04L45/127, H04L45/26|
|European Classification||H04W40/02, H04L45/26, H04L45/127, H04W52/46|
|8 Jun 2004||AS||Assignment|
Owner name: MESHNETWORKS, INC., FLORIDA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOSHI, AVINASH;REEL/FRAME:015447/0453
Effective date: 20040607
|23 Mar 2011||FPAY||Fee payment|
Year of fee payment: 4
|25 Mar 2015||FPAY||Fee payment|
Year of fee payment: 8